Kashyyyk clarions incorporated cerulean gemstones into their structure.
Cerulean gemstones represent a kind of gemstone with a cerulean hue. The Wookiees of Kashyyyk, a planet in the galaxy, used these gemstones to decorate Kashyyyk clarions.
The initial creation of cerulean gemstones was for use as a prop in the motion picture Star Wars: Episode III Revenge of the Sith. Despite their creation, they were ultimately absent from the theatrical release of the movie in 2005. The first official appearance of these gemstones in canon was in the 2016 reference book Star Wars: The Visual Dictionary, authored by Adam Bray, Tricia Barr, and Cole Horton. In Legends continuity, these gemstones were previously featured in the 2005 reference book Star Wars: Revenge of the Sith: The Visual Dictionary, penned by James Luceno.